Weed Impede 2 in 1 Concentrate is both a weed killer and an effective weed controller. One active ingredient kills the existing weeds and the other goes into the soil to prevent and thus control weeds that have not yet emerged. This weed control product can be used in driveways, sidewalks, patios, gravel areas, around established trees and shrubs, etc. Weed control for an entire season with one application. Also available in a ready to use formulation for spot treatment of weeds in patio, driveways, curb areas, gutters, fencelines, landscaped areas, and other various places.